Unfold / peel off animation
You can try Plane deformed by Curve modifier plus Mirror modifier

It is quite tricky to work with curve for me. But in this case just add Curve, switch type to 2D (under Curve Properties), rotate 90°on X, in edit mode shape curve as you need. In object mode rotate on Z axis to let curve peel from cornet. Before you add paper a Curve modifier move curve object origin to paper's left top corner. Animate curve's Location.